Antennal electrophysiological responses to the pheromone components.

<p>(A) The antennal response of <i>O. formosanus</i> workers to a 60 sternal gland extract on a DB-WAX column showing a significant and reproducible response of the antennae at the retention times 6.83 min and 7.12 min (Y-scale EAD = 1.0 mV/div, Y-scale FID = 2.0 mV/div), the same retention times for synthetic (3<i>Z</i>)-dodec-3-en-1-ol (DOE) and (3<i>Z</i>,6<i>Z</i>)-dodeca-3,6-dien-1-ol (DDE), respectively. (B) The antennae of workers of <i>O. formosanus</i> showing significant responses (peaks: 1, –0.08 mV; 2, –0.08 mV; 4, –0.06 mV, 5, –0.04 mV; and 6, –0.06 mV, T-test, P<0.001, n = 10) to DOE and/or to DDE when or 5 min after being exposed to DOE atmosphere (0.05 ng/mL for 10 min) or DDE atmosphere (same conditions) or not treated (the non-significant peaks being 3, 7, 8, 9 and 10). The column used was an HP-FFAP column.